Some determinations of liquid‐phase diffusion coefficients by means of an improved diaphragm cell

The integral diffusion coefficients of acetone, acetic acid, benzoic acid, diethylamine and uranyl nitrate in water and in a number of organic solvents have been determined at 20°. The mutual diffusion coefficients of four partially miscible solvent‐water pairs have also been determined, the solvents being aniline, ethyl acetate, furfuraldehyde and iso butanol. An improved diaphragm cell was used for these measurements, both compartments being agitated by electromagnetically driven stirrers. The existence of a critical stirring rate, different for each cell, below which the cell constant varied was demonstrated. An Appendix is included demonstrating how differential diffusion constants could be determined directly with a cell of this type.